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FreeBSD 11.0 - man page for i386_set_ioperm (freebsd section 2)

I386_GET_IOPERM(2)					      BSD System Calls Manual						I386_GET_IOPERM(2)

NAME
i386_get_ioperm, i386_set_ioperm -- manage per-process access to the i386 I/O port space
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <machine/sysarch.h> int i386_get_ioperm(unsigned int start, unsigned int *length, int *enable); int i386_set_ioperm(unsigned int start, unsigned int length, int enable);
DESCRIPTION
The i386_get_ioperm() system call will return the permission for the process' I/O port space in the *enable argument. The port range starts at start and the number of contiguous entries will be returned in *length. The i386_set_ioperm() system call will set access to a range of I/O ports described by the start and length arguments to the state specified by the enable argument.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
The i386_get_ioperm() and i386_set_ioperm() system calls will fail if: [EINVAL] An invalid range was specified by the start or length arguments. [EPERM] The caller of i386_set_ioperm was not the superuser.
SEE ALSO
io(4)
AUTHORS
This man page was written by Jonathan Lemon.
BSD
July 27, 1998 BSD